Survived from an isolated orbit of Krypton's destruction leaves a civilization of Argo City floating off into space and time. Scientist Zor-El is a brother to Jor-El who is inventing a rocket ship to send his daughter Kara to Planet Earth to live with her cousin. On Earth she becomes "The Girl of Steel" with same powers that her cousin has. She meets up with her cousin and lives with his mom at the Kansas farm of Smallville. She is called Kara Kent as his teenage sister. And she fights crime with him as heroes. She becomes his secret weapon to the world. They face off their arch-nemesis enemy Brainiac who taken over the city called Kandor.